Rock-drill



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A Gy. W. JONES.

BooK-DRILL. y

Patented Feb. 2 6, 1895.

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INITED STATES PATENT EEicE.

Y GEORGE W. JONES, OF CLEVELAND, OHIO.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 534,692, dated February26, 1895..

Application iiled April `30, 1894.

To all whom, t wuty concern:

Be it known that I, GEORGE W. JONES, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented certain new and useful Improvements in Rock-Drills; and I dohereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains 'to make and use the same.

My invention relates to rock drills, and the invention consists of theconstruction and combination of parts substantially as shown anddescribed and particularly pointed out in the claims. Y

In the accompanying drawings, Figurel is a vertical central sectionalelevation of the -drill supporting and actuating mechanism.

Fig. 2 is a vertical elevation of said mechan ism with the parts shownin Fig. l turned quarter way around. Fig. 3 is a cross section enlargedon line Fig. 2, looking down. Fig. 4 is a vertical sectional elevationon a line corresponding to z, z, Fig. 6, looking downward. Fig. 5 is anelevation of the parts shown in Fig. 4 with the upper part in section online y, y, Fig. 6. Fig. 6 is across section on a line corresponding toline x, x, Figs. 4 and 5. Fig. 7, Sheet 1, is an enlarged sectional viewof parts of the valve mechanism.

The construction here shown comprises a supporting saddle A clamped uponthe cross shaft or rod B by clamping screws -2- passing through the jaws-3- of the saddle A. Attached to the said saddle and adjustable as tothe angle on the shaft F is the vertical supporting back having a hubupon its rear provided with a beveled flange adapted toengage in abeveled seat upon the face of the saddle A.

The foregoing mechanism is the subjectmatter of another applicationbearing Serial No. 519,808.

The seat on the saddle A is undercut both at the bottom and sides, Figs.l and 6, and' the hanged hub -l5- is inserted from above. Acorrespondingly dovetailed or beveled cross-piece -16- engages the upperedge of the iiange -15- and is held firmly therein by a short lockingbolt 1S- entering through the'slotin the top of vhub A, as seen in Fig.3. By these means, or their equiva- Serial No. 509,451. (No model.)

lent, the parts A and H are made rigid with one another but are alsoseparable.

The mechanism for operating the drill is suspended from the backsupporting piece H by means of a long threaded screw rod L, which passesthrough the head -20- of the support H, and a handled lever 2l-serves t0turn said screw rod in either direction as the operations of the drillmay require. The drill Aactuating steam cylinder M is supported uponthis rod L through the projection-22- at its rear, and this projection,Fig. 6, has lateral flanges -23- which work in guideways, grooves orchannels in the sides of the back support H, so that as the cylinder andpartsare adjpsted up and down by means of the threaded. rod L they areconfinedin their proper relation and place by said flanges andchannels'.

In the steam cylinder M is a reciprocating piston N having heads -24-with inclined or curved surfaces -25- at their base constructed toactuate the valves as hereinafter described. At one side and centrallyof the cylinder M is a valve chamber -27 with separate cylindrical,barrel shaped, perforated valves -28- at the ends of said chamber and atright angles to the axis of the piston. These valves have central headedstems -29- projecting inward toward the piston,

and a rock bar -30-, pivoted at its center, overlaps these heads at itsends and is itself actuated by the piston N, the inclined vsurfaces -25-of said piston striking the eX- tremities of the said bar alternatelyand alternately depressing the Valves-28+ according as the piston N ismoved in one direction or the other. A central diaphragm -26- in valve2S- carries said headed stems -2 9- and the inlet and exhaust holes areon opposite sides ot this diaphragm. Each valve 28 is pressed back bythe live steam when pressure by rock bar -30- is relieved. The piston Nis connected rigidly with the drill rod O by means of a connecting rodP, which is suitably packed where it passes through the head of saidcylinder.

At its upper end the piston N has a central bore'extendin g inward intoits neck some distance, and this bore has spiral grooves correspondingin section to the formation of the IOO spiral shaft R. When the drill iscarried down to work it is desirable that the action should be straightand direct without turning, but in order that it shall not strike itssuccessive blows at the same place, but vary the same step by step, Ihave provided means for rotating the drill slightly on each up or returnmovement. This consists in a short spiral rod R, supported in the headof the cylinder M by means ot a collar or head T rigid therewith andresting upon a plate -32--. forming the immediate head ot the cylinderbut built in between the part S and the flange of the cylinder. Thecollar T is set into a recess in the head piece S above plate 32, andaround aboutthis collar is a spring` clamp -33-, having enlargedextremities #34E- and -35- projecting laterallyinto a side recess Withinhead part S. The arm 3ftrests against the side ot this recess, While amovable steam actuated cylindrical plug' -37- is adapted to pressagainst the arm -35- of the said clamping ring. New, in order that thesaid ring may be tightened when the piston N is on the up stroke, lprovide the said plug -87- and a steam channel 3dfrom the bottoni ofcylinder ll/I, for steam to enter the chamber behind said plug. Thispresses the plug 37- inward and tightens the clam p -33-, thus causingthe clamp to lock on the collar T and hold it from turning. Hence, whenthe pistou rises the piston must turn upon the rod B., anditheirconnection being spiral, the piston necessarily must rotate as it risesand thus give a turning movement to the drill. Vhen the piston is on thedown stroke the steam is cut ott' from channel -39- and plug -37- andthe spiral rod R with its collar T is caused to turn as the piston andthe drill make a direct down stroke. 1

The spirally grooved rod R is adapted to turn in the plate -32- and whensteam enters the chamber above the piston it may also enter the chamberin which the head T and clamp -3- are located, and in doing so it willdrive the plug -37- back so as to release the said clamp from the headT, if it be not already released; but when the steam exhausts from thechamber above the piston and enters the chamber beneath and acts uponthe head of plug -37- there is no pressure in the clamp chamber andhence nothing to interfere with the action of said plug in locking saidclamp on the head T.

Having thus described my invention, what I claim isl. The mechanismherein described for rotating the drill, consisting in the steam cylinder and the piston therein, and the dri-ll rigidly connected with saidpiston, in combination with a steam chamber at the head of saidcylinder, a spiral rod extending into the said piston and having a headin the said steam chamber, and a clamp in said chamber about the edge ofsaid head to engage and hold said head and rod from turning,substantially as set forth.

2. The means described for rotating the drill, consisting ot the pistonand the drill rod connected rigidly therewith, the cylinder in whichsaid piston operates, a chamber outside said cylinder, a head on saidrod located in said chamber, and a clamping band in said chamber and asteam actuated plug to tighten said band, substantially as set forth.

3. The construction described, consisting ot the steam cylinder and thechamber at the head of said cylinder, and a steam duct leading from thebottom of said cylinder to said chamber, in combination with a drillactuating piston in said cylinderl having a bore down through itscenter, a spiral rod working in said bore and provided with ahead in thesaid chamber, a band encircling said head and a steam actuated plug tobear against the end of said band and tighten the same, substantially asset forth.

4t. The construction described, consisting of the cylinder having avalve chamber at one side thereof, and abarrel shaped valve at each endof said chamber having a central diaphragm, and perforations on eachside of said diaphragm entering into said valve, in combination with apiston in said cylinder having heads at its ends, a rock bar betweensaid Valves and said piston and pivoted at its center and having itsends projecting into thev path of the said piston, whereby when thepiston travels back and forth it alternately depresses the ends of saidrock bar and actuates said valves, substantially as set forth.

Witness my hand to the foregoing specification.

GEORGE W. JONES.

Witnesses:

II. T. FIsHER,

GEORGIA SCHAEFFER.

IOO

